The significance of power battery state of charge estimation is to provide the remaining capacity of the battery to facilitate the driver to understand the vehicle's continued driving mileage, so as to improve the efficiency of the use of battery energy, improve vehicle performance. This paper presents a review of the current methods for estimating the state of power battery state of charge. The method of discharge test, open circuit voltage method, support vector regression and system filtering method are introduced in detail. In the end, the research conclusion is drawn, and the best method is reviewed, and the development of the power battery state of charge estimation method is provided.%动力电池荷电状态估算的意义在于提供电池剩余容量方便驾驶员及时了解汽车的续驶里程，从而提高电池能量的使用效率，提高电动车的整车性能。综述性地介绍了目前常用的动力电池荷电状态估算的方法，详细介绍了放电试验法、开路电压法、支持向量回归法和系统滤波方法等7种方法；最后列表对比各种方法之间的特点。最后得出研究结论，评述了应用中最佳的方法，同时对未来动力电池荷电状态估算方法的发展提供必要的说明。
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